trunk/src/extban.c

/*
 *  ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
 *
 *  Copyright (c) 2015-2016 plexus development team
 *  Copyright (c) 2019-2020 ircd-hybrid development team
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
 *  USA
 */

/*! \file extban.c
 * \brief Implements extended channel bans.
 * \version $Id$
 */

#include "stdinc.h"
#include "ircd_defs.h"
#include "list.h"
#include "irc_string.h"
#include "user.h"
#include "isupport.h"
#include "extban.h"


static dlink_list extban_list;
static unsigned int matching_mask, acting_mask;


static unsigned int
extban_find_mask(void)
{
  dlink_node *node;
  unsigned int used = 0;
  unsigned int i;

  DLINK_FOREACH(node, extban_list.head)
  {
    const struct Extban *extban = node->data;
    used |= extban->flag;
  }

  for (i = 1; (i < EXTBAN_MASK) && (used & i); i <<= 1)
    ;

  return i;
}

void
extban_init(void)
{
  extban_add(&extban_account);
  extban_add(&extban_channel);
  extban_add(&extban_fingerprint);
  extban_add(&extban_gecos);
  extban_add(&extban_join);
  extban_add(&extban_mute);
  extban_add(&extban_operclass);
  extban_add(&extban_server);
  extban_add(&extban_usermode);

  const char *ptr = extban_get_isupport();
  if (ptr)
    isupport_add("EXTBAN", ptr, -1);
}

void
extban_add(struct Extban *extban)
{
  unsigned int mask = extban_find_mask();

  if (mask == 0)
    return;

  extban->flag = mask;
  dlinkAdd(extban, &extban->node, &extban_list);

  if (extban->type & EXTBAN_MATCHING)
    matching_mask |= mask;
  if (extban->type & EXTBAN_ACTING)
    acting_mask |= mask;
}

void
extban_del(struct Extban *extban)
{
  if (extban->flag == 0)
    return;

  dlinkDelete(&extban->node, &extban_list);

  matching_mask &= ~extban->flag;
  acting_mask &= ~extban->flag;
}

struct Extban *
extban_find(unsigned char c)
{
  dlink_node *node;

  DLINK_FOREACH(node, extban_list.head)
  {
    struct Extban *extban = node->data;

    if (extban->character == c)
      return extban;
  }

  return NULL;
}

struct Extban *
extban_find_flag(unsigned int flag)
{
  dlink_node *node;

  DLINK_FOREACH(node, extban_list.head)
  {
    struct Extban *extban = node->data;

    if (extban->flag == flag)
      return extban;
  }

  return NULL;
}

enum extban_type
extban_parse(const char *mask, unsigned int *input_extbans, unsigned int *offset)
{
  *input_extbans = 0;
  *offset = 0;

  if (*mask == '$' && IsAlpha(*(mask + 1)) && *(mask + 2) == ':')
  {
    struct Extban *extban = extban_find(*(mask + 1));
    if (extban == NULL)
      return EXTBAN_INVALID;

    *input_extbans |= extban->flag;
    *offset += 3;
    mask += 3;

    /* Matching extbans take a special parameter, so stop reading */
    if (extban->type == EXTBAN_MATCHING)
      return EXTBAN_MATCHING;

    if (IsAlpha(*mask) && *(mask + 1) == ':')
    {
      extban = extban_find(*mask);
      if (extban == NULL)
        return EXTBAN_INVALID;

      /* Two acting extbans make no sense */
      if (extban->type == EXTBAN_ACTING)
        return EXTBAN_INVALID;

      /* Check parameter */
      if (extban->is_valid && extban->is_valid(mask) == EXTBAN_INVALID)
        return EXTBAN_INVALID;

      *input_extbans |= extban->flag;
      *offset += 2;
      mask += 2;

      return EXTBAN_MATCHING;
    }

    return EXTBAN_ACTING;
  }

  return EXTBAN_NONE;
}

unsigned int
extban_format(unsigned int e, char *buf)
{
  dlink_node *node;
  unsigned int written = 0;

  DLINK_FOREACH(node, extban_list.head)
  {
    struct Extban *extban = node->data;

    if (extban->type != EXTBAN_ACTING)
      continue;

    if (extban->flag & e)
    {
      if (written == 0)
      {
        written++;
        *buf++ = '$';
      }

      *buf++ = extban->character;
      *buf++ = ':';

      written += 2;
    }
  }

  DLINK_FOREACH(node, extban_list.head)
  {
    struct Extban *extban = node->data;

    if (extban->type != EXTBAN_MATCHING)
      continue;

    if (extban->flag & e)
    {
      if (written == 0)
      {
        written++;
        *buf++ = '$';
      }

      *buf++ = extban->character;
      *buf++ = ':';
      written += 2;
    }
  }

  return written;
}

unsigned int
extban_matching_mask(void)
{
  return matching_mask;
}

unsigned int
extban_acting_mask(void)
{
  return acting_mask;
}

const char *
extban_get_isupport(void)
{
  dlink_node *node;
  char extban_chars[256] = { 0 };
  static char buf[sizeof(extban_chars) + 3 /* +3 = $,\0 */ ];

  if (dlink_list_length(&extban_list) == 0)
    return NULL;

  DLINK_FOREACH(node, extban_list.head)
  {
    struct Extban *extban = node->data;
    extban_chars[extban->character] = extban->character;
  }

  char *p = buf + strlcpy(buf, "$,", sizeof(buf));

  for (unsigned int i = 0; i < 256; ++i)
    if (extban_chars[i])
      *p++ = extban_chars[i];
  *p++ = '\0';

  return buf;
}

Revision:	9242
Committed:	Fri Jan 31 18:26:31 2020 UTC (5 years, 6 months ago) by michael
Content type:	text/x-csrc
File size:	5502 byte(s)
Log Message:	- extban.c:extban_get_isupport(): remove extraneous cast
#	User	Rev	Content
1	michael	9234	/*
2			* ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
3			*
4			* Copyright (c) 2015-2016 plexus development team
5			* Copyright (c) 2019-2020 ircd-hybrid development team
6			*
7			* This program is free software; you can redistribute it and/or modify
8			* it under the terms of the GNU General Public License as published by
9			* the Free Software Foundation; either version 2 of the License, or
10			* (at your option) any later version.
11			*
12			* This program is distributed in the hope that it will be useful,
13			* but WITHOUT ANY WARRANTY; without even the implied warranty of
14			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15			* GNU General Public License for more details.
16			*
17			* You should have received a copy of the GNU General Public License
18			* along with this program; if not, write to the Free Software
19			* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
20			* USA
21			*/
22
23			/*! \file extban.c
24			* \brief Implements extended channel bans.
25	michael	9238	* \version $Id$
26	michael	9234	*/
27
28			#include "stdinc.h"
29			#include "ircd_defs.h"
30			#include "list.h"
31			#include "irc_string.h"
32			#include "user.h"
33			#include "isupport.h"
34			#include "extban.h"
35
36
37			static dlink_list extban_list;
38			static unsigned int matching_mask, acting_mask;
39
40
41			static unsigned int
42			extban_find_mask(void)
43			{
44			dlink_node *node;
45			unsigned int used = 0;
46			unsigned int i;
47
48			DLINK_FOREACH(node, extban_list.head)
49			{
50			const struct Extban *extban = node->data;
51			used \|= extban->flag;
52			}
53
54			for (i = 1; (i < EXTBAN_MASK) && (used & i); i <<= 1)
55			;
56
57			return i;
58			}
59
60			void
61			extban_init(void)
62			{
63			extban_add(&extban_account);
64			extban_add(&extban_channel);
65			extban_add(&extban_fingerprint);
66			extban_add(&extban_gecos);
67			extban_add(&extban_join);
68			extban_add(&extban_mute);
69			extban_add(&extban_operclass);
70			extban_add(&extban_server);
71			extban_add(&extban_usermode);
72
73			const char *ptr = extban_get_isupport();
74			if (ptr)
75			isupport_add("EXTBAN", ptr, -1);
76			}
77
78			void
79			extban_add(struct Extban *extban)
80			{
81			unsigned int mask = extban_find_mask();
82
83			if (mask == 0)
84			return;
85
86			extban->flag = mask;
87			dlinkAdd(extban, &extban->node, &extban_list);
88
89			if (extban->type & EXTBAN_MATCHING)
90			matching_mask \|= mask;
91			if (extban->type & EXTBAN_ACTING)
92			acting_mask \|= mask;
93			}
94
95			void
96			extban_del(struct Extban *extban)
97			{
98			if (extban->flag == 0)
99			return;
100
101			dlinkDelete(&extban->node, &extban_list);
102
103			matching_mask &= ~extban->flag;
104			acting_mask &= ~extban->flag;
105			}
106
107			struct Extban *
108			extban_find(unsigned char c)
109			{
110			dlink_node *node;
111
112			DLINK_FOREACH(node, extban_list.head)
113			{
114			struct Extban *extban = node->data;
115
116			if (extban->character == c)
117			return extban;
118			}
119
120			return NULL;
121			}
122
123			struct Extban *
124			extban_find_flag(unsigned int flag)
125			{
126			dlink_node *node;
127
128			DLINK_FOREACH(node, extban_list.head)
129			{
130			struct Extban *extban = node->data;
131
132			if (extban->flag == flag)
133			return extban;
134			}
135
136			return NULL;
137			}
138
139			enum extban_type
140			extban_parse(const char mask, unsigned int input_extbans, unsigned int *offset)
141			{
142			*input_extbans = 0;
143			*offset = 0;
144
145			if (mask == '$' && IsAlpha((mask + 1)) && *(mask + 2) == ':')
146			{
147			struct Extban extban = extban_find((mask + 1));
148			if (extban == NULL)
149			return EXTBAN_INVALID;
150
151			*input_extbans \|= extban->flag;
152			*offset += 3;
153			mask += 3;
154
155			/* Matching extbans take a special parameter, so stop reading */
156			if (extban->type == EXTBAN_MATCHING)
157			return EXTBAN_MATCHING;
158
159			if (IsAlpha(mask) && (mask + 1) == ':')
160			{
161			extban = extban_find(*mask);
162			if (extban == NULL)
163			return EXTBAN_INVALID;
164
165			/* Two acting extbans make no sense */
166			if (extban->type == EXTBAN_ACTING)
167			return EXTBAN_INVALID;
168
169			/* Check parameter */
170			if (extban->is_valid && extban->is_valid(mask) == EXTBAN_INVALID)
171			return EXTBAN_INVALID;
172
173			*input_extbans \|= extban->flag;
174			*offset += 2;
175			mask += 2;
176
177			return EXTBAN_MATCHING;
178			}
179
180			return EXTBAN_ACTING;
181			}
182
183			return EXTBAN_NONE;
184			}
185
186			unsigned int
187			extban_format(unsigned int e, char *buf)
188			{
189			dlink_node *node;
190			unsigned int written = 0;
191
192			DLINK_FOREACH(node, extban_list.head)
193			{
194			struct Extban *extban = node->data;
195
196			if (extban->type != EXTBAN_ACTING)
197			continue;
198
199			if (extban->flag & e)
200			{
201			if (written == 0)
202			{
203			written++;
204			*buf++ = '$';
205			}
206
207			*buf++ = extban->character;
208			*buf++ = ':';
209
210			written += 2;
211			}
212			}
213
214			DLINK_FOREACH(node, extban_list.head)
215			{
216			struct Extban *extban = node->data;
217
218			if (extban->type != EXTBAN_MATCHING)
219			continue;
220
221			if (extban->flag & e)
222			{
223			if (written == 0)
224			{
225			written++;
226			*buf++ = '$';
227			}
228
229			*buf++ = extban->character;
230			*buf++ = ':';
231			written += 2;
232			}
233			}
234
235			return written;
236			}
237
238			unsigned int
239			extban_matching_mask(void)
240			{
241			return matching_mask;
242			}
243
244			unsigned int
245			extban_acting_mask(void)
246			{
247			return acting_mask;
248			}
249
250			const char *
251			extban_get_isupport(void)
252			{
253			dlink_node *node;
254			char extban_chars[256] = { 0 };
255			static char buf[sizeof(extban_chars) + 3 /* +3 = $,\0 */ ];
256
257			if (dlink_list_length(&extban_list) == 0)
258			return NULL;
259
260			DLINK_FOREACH(node, extban_list.head)
261			{
262			struct Extban *extban = node->data;
263	michael	9242	extban_chars[extban->character] = extban->character;
264	michael	9234	}
265
266			char *p = buf + strlcpy(buf, "$,", sizeof(buf));
267
268			for (unsigned int i = 0; i < 256; ++i)
269			if (extban_chars[i])
270			*p++ = extban_chars[i];
271			*p++ = '\0';
272
273			return buf;
274			}
275